The aim of the study was to investigate the clinical-anatomical peculiarities of edentulous mandibular dental segments (eMDS), situated in the posterior mandible, as well as to estimate the possibility of dental implantation for every clinical-anatomical eMDS type. One hundred and ninety-eight patients were examined, 88 male and 110 female. Orthopantomography, computer tomography, clinical examination using special ridge - mapping calipers for measurement of alveolar process width were employed to estimate eMDS. Three hundred anf fifty-three screw-shaped single-stage OSTEOFIX Dental Implant System implants were inserted. In 346 (98.02%) cases implantation was successful. Concerning the results of the eMDS measurements, the literature data suggested the division of posterior mandible dental segments into the following three clinical - anatomical types: type I - atrophy of eMDS is absent or if present, proper implantation is available; type II - simultaneous

implantation is available only with augmentation of the alveolar ridge; type III - only delayed implantation is available after augmentation of the alveolar ridge.